<!DOCTYPE html>
<html lang="zh">
<head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <title>Bootstrap实例</title>

    <!-- Bootstrap CSS -->
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    <!--<link rel="stylesheet" href="../../../libs/bootstrap4/css/bootstrap.css">-->

    <!-- Optional JavaScript -->
    <!-- jQuery first, then Popper.js, then Bootstrap JS -->
    <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
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    <style>
        body>div{
            margin-bottom: 50px;
        }
    </style>
</head>
<body>

<nav class="navbar navbar-expand-sm bg-light">
    <ul class="navbar-nav">
        <li class="nav-item">
            <a class="nav-link" href="#">Link 1</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link 2</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link 3</a>
        </li>
    </ul>
</nav>
<br>

<div class="container-fluid">
    <h3>简单的导航栏实例</h3>
    <p>导航栏一般放在页面的顶部。</p>
    <p>我们可以使用 .navbar 类来创建一个标准的导航栏，后面紧跟: .navbar-expand-xl|lg|md|sm 类来创建响应式的导航栏 (大屏幕水平铺开，小屏幕垂直堆叠)。</p>
</div>

<nav class="navbar bg-light">
    <ul class="navbar-nav">
        <li class="nav-item">
            <a class="nav-link" href="#">Link 1</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link 2</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link 3</a>
        </li>
    </ul>
</nav>
<br>

<div class="container-fluid">
    <h3>垂直导航栏</h3>
    <p>导航栏一般在页面头部。</p>
</div>

<div class="container">
    <h3>不同颜色导航栏</h3>
    <p>对于暗色背景需要设置文本颜色为浅色的，对于浅色背景需要设置文本颜色为深色的。</p>
</div>

<nav class="navbar navbar-expand-sm bg-light navbar-light">
    <ul class="navbar-nav">
        <li class="nav-item active">
            <a class="nav-link" href="#">Active</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link</a>
        </li>
        <li class="nav-item">
            <a class="nav-link disabled" href="#">Disabled</a>
        </li>
    </ul>
</nav>

<nav class="navbar navbar-expand-sm bg-dark navbar-dark">
    <ul class="navbar-nav">
        <li class="nav-item active">
            <a class="nav-link" href="#">Active</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link</a>
        </li>
        <li class="nav-item">
            <a class="nav-link disabled" href="#">Disabled</a>
        </li>
    </ul>
</nav>

<nav class="navbar navbar-expand-sm bg-primary navbar-dark">
    <ul class="navbar-nav">
        <li class="nav-item active">
            <a class="nav-link" href="#">Active</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link</a>
        </li>
        <li class="nav-item">
            <a class="nav-link disabled" href="#">Disabled</a>
        </li>
    </ul>
</nav>

<nav class="navbar navbar-expand-sm bg-success navbar-dark">
    <ul class="navbar-nav">
        <li class="nav-item active">
            <a class="nav-link" href="#">Active</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link</a>
        </li>
        <li class="nav-item">
            <a class="nav-link disabled" href="#">Disabled</a>
        </li>
    </ul>
</nav>

<nav class="navbar navbar-expand-sm bg-info navbar-dark">
    <ul class="navbar-nav">
        <li class="nav-item active">
            <a class="nav-link" href="#">Active</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link</a>
        </li>
        <li class="nav-item">
            <a class="nav-link disabled" href="#">Disabled</a>
        </li>
    </ul>
</nav>

<nav class="navbar navbar-expand-sm bg-warning navbar-dark">
    <ul class="navbar-nav">
        <li class="nav-item active">
            <a class="nav-link" href="#">Active</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link</a>
        </li>
        <li class="nav-item">
            <a class="nav-link disabled" href="#">Disabled</a>
        </li>
    </ul>
</nav>

<nav class="navbar navbar-expand-sm bg-danger navbar-dark">
    <ul class="navbar-nav">
        <li class="nav-item active">
            <a class="nav-link" href="#">Active</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link</a>
        </li>
        <li class="nav-item">
            <a class="nav-link disabled" href="#">Disabled</a>
        </li>
    </ul>
</nav>

<nav class="navbar navbar-expand-sm bg-secondary navbar-dark">
    <ul class="navbar-nav">
        <li class="nav-item active">
            <a class="nav-link" href="#">Active</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link</a>
        </li>
        <li class="nav-item">
            <a class="nav-link disabled" href="#">Disabled</a>
        </li>
    </ul>
</nav>
<div></div>
<nav class="navbar navbar-expand-sm bg-dark navbar-dark">
    <!-- Brand/logo -->
    <a class="navbar-brand" href="#">Logo</a>

    <!-- Links -->
    <ul class="navbar-nav">
        <li class="nav-item">
            <a class="nav-link" href="#">Link 1</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link 2</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link 3</a>
        </li>
    </ul>
</nav>

<div class="container-fluid">
    <h3>品牌/Logo</h3>
    <p>.navbar-brand 类用于高亮显示品牌/Logo:</p>
</div>

<nav class="navbar navbar-expand-sm bg-dark navbar-dark">
    <!-- Brand/logo -->
    <a class="navbar-brand" href="#">
        <img src="http://static.runoob.com/images/mix/bird.jpg" alt="logo" style="width:40px;">
    </a>

    <!-- Links -->
    <ul class="navbar-nav">
        <li class="nav-item">
            <a class="nav-link" href="#">Link 1</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link 2</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link 3</a>
        </li>
    </ul>
</nav>

<div class="container-fluid">
    <h3>品牌 / Logo</h3>
    <p>果使用图片，可以使用 .navbar-brand 类来设置图片自适应导航栏。</p>
</div>

<nav class="navbar navbar-expand-md bg-dark navbar-dark">
    <a class="navbar-brand" href="#">Navbar</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#collapsibleNavbar">
        <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="collapsibleNavbar">
        <ul class="navbar-nav">
            <li class="nav-item">
                <a class="nav-link" href="#">Link</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Link</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Link</a>
            </li>
        </ul>
    </div>
</nav>
<br>

<div class="container">
    <h3>折叠导航栏</h3>
    <p>通常，小屏幕上我们都会折叠导航栏，通过点击来显示导航选项。</p>
    <p>提示: 如果你删除 .navbar-expand-md 类，导航链接会一直隐藏，且切换按钮会一直显示。</p>
    <p>
        通常，小屏幕上我们都会折叠导航栏，通过点击来显示导航选项。

        要创建折叠导航栏，可以在按钮上添加 class="navbar-toggler", data-toggle="collapse" 与 data-target="#thetarget" 类。然后在设置了 class="collapse navbar-collapse" 类的 div 上包裹导航内容（链接）, div 元素上的 id 匹配按钮 data-target 的上指定的 id:
    </p>
</div>
<nav class="navbar navbar-expand-sm bg-dark navbar-dark">
    <!-- Brand -->
    <a class="navbar-brand" href="#">Logo</a>

    <!-- Links -->
    <ul class="navbar-nav">
        <li class="nav-item">
            <a class="nav-link" href="#">Link 1</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link 2</a>
        </li>

        <!-- Dropdown -->
        <li class="nav-item dropdown">
            <a class="nav-link dropdown-toggle" href="#" id="navbardrop" data-toggle="dropdown">
                Dropdown link
            </a>
            <div class="dropdown-menu">
                <a class="dropdown-item" href="#">Link 1</a>
                <a class="dropdown-item" href="#">Link 2</a>
                <a class="dropdown-item" href="#">Link 3</a>
            </div>
        </li>
    </ul>
</nav>
<br>

<div class="container">
    <h3>导航栏使用下拉菜单</h3>
    <p>导航栏上可以设置下拉菜单。</p>
</div>

<nav class="navbar navbar-expand-sm bg-dark navbar-dark">
    <form class="form-inline">
        <input class="form-control" type="text" placeholder="Search">
        <button class="btn btn-success" type="button">Search</button>
    </form>
</nav>
<br>

<div class="container">
    <h3>导航栏的表单</h3>
    <p>导航栏的表单 form 元素使用 class="form-inline" 类来排版输入框与按钮：</p>
</div>

<nav class="navbar navbar-expand-sm bg-dark navbar-dark">
    <form class="form-inline">
        <div class="input-group">
            <span class="input-group-addon">@</span>
            <input type="text" class="form-control" placeholder="Username">
        </div>
    </form>
</nav>
<br>

<div class="container">
    <h3>导航表单</h3>
    <p> .input-group-addon 类用于在输入框前添加小标签。</p>
</div>

<nav class="navbar navbar-expand-sm bg-dark navbar-dark">
    <!-- Links -->
    <ul class="navbar-nav">
        <li class="nav-item">
            <a class="nav-link" href="#">Link 1</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link 2</a>
        </li>
    </ul>
    <!-- Navbar text-->
    <span class="navbar-text">
    Navbar text
  </span>
</nav>
<br>

<div class="container">
    <h3>导航栏文本</h3>
    <p>使用 .navbar-text 类来设置导航栏上非链接文本，可以保证水平对齐，颜色与内边距一样。</p>
</div>

<nav class="navbar navbar-expand-sm bg-dark navbar-dark fixed-top">
    <a class="navbar-brand" href="#">Logo</a>
    <ul class="navbar-nav">
        <li class="nav-item">
            <a class="nav-link" href="#">Link</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link</a>
        </li>
    </ul>
</nav>

<div class="container-fluid" style="margin-top:80px">
    <h3>固定导航栏</h3>
    <p>导航栏可以固定在头部或者底部。</p>
    <h1>滚动页面查看效果。</h1>
</div>

<nav class="navbar navbar-expand-sm bg-dark navbar-dark fixed-bottom">
    <a class="navbar-brand" href="#">Logo</a>
    <ul class="navbar-nav">
        <li class="nav-item">
            <a class="nav-link" href="javascript:void(0)">Link</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="javascript:void(0)">Link</a>
        </li>
    </ul>
</nav>

<div class="container-fluid">
    <h3>底部固定导航栏</h3>
    <p>导航栏可以固定在头部或者底部。</p>
    <h1>滚动页面查看效果。</h1>
</div>
</body>
</html>